Heat oven to 400~. Separate dough into four long rectangles. Place rectangles crosswise in ungreased 15"x10" jellyroll pan; press over bottom and 1" up sides to form crust. Seal perforations. Bake for 5 mins. Remove from oven. Sprinkle partially baked crust with cheeses, shrimp, and crabmeat. In lg. Bowl, combine half and half, eggs, dry mustard, Worcestershire sauce, and hot pepper sauce; mix well. Pour over ingredients in pan; sprinkle with parsley. Return to oven and bake an additional 25 to 30 mins. Or until knife insertedin center comes out clean and edges are golden brown. Cool 5 mins., cut into squares. Serve warm.